RFC 9110 14.2 defines range handling only for GET, and a server must
ignore a Range header on any other method. The server parsed it on
every method, so a POST with a Range got a 206 slice of the handler's
response, or a 416 when the Range was malformed. Range is now parsed
only for GET and HEAD; other methods get the whole response, and a
handler can still read the header itself.
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